Polish bod grip



Aprifi 7, 1936. a I .i M1 T ARCHER 2,035,992

POLISH ROD GRIP I Filed May 18, 1935 INVENTOR Patented Apr. 7, 1936PATENT oFFmE POLISH ROD GRIP Merton T. Archer, Toledo, Ohio, assignor toThe National-Superior Company, Toledo, Ohio, a corporation of DelawareApplication May 18, 1933, Serial No. 671,637

9 Claims.

This invention relates to grips or clamps for connecting the pump orpolish rods to their operating means.

One object of the invention is to provide a compound lever systemarranged to effect an efficient non-slipping connection between thepolish rod and the grip.

Referring to the accompanying drawing, Fig. 1 is a side elevation of myinvention; Fig. 2, a section on the line 2-2 on Fig. 1; and Fig. 3, anend view of the invention, showing the latch opened in dotted lines.

On the drawing, I designates the base or body member of the grip and 2indicates the cap member hingedly connected to the base member by thehinge-pin 3 in the base member and in the hinge-ears 4 carried by thecap member.

Links 5 and 6 are pivotally attached to the base member at the sideopposite the hinge-ears 4 by the pin I. The upper end of the link 5 hasthe pivot pin 8 lying transversely of the pivot pin I. A lever 9 ispivoted at one end on the pin 8 and has its remaining end lying abovethe upper end of the link 6. The central part of the lever lies on theforwardly projecting-lug II] on the front of the cap member 2. The upperend of the link 6 has the upstanding threaded stud II which extends upthrough the lever 9 and carries the nut I2 adapted to be screwed downagainst the lever 9.

The upper side of the base member I has the longitudinal groove I3directly below the corresponding groove I4 of the cap member 2. On theunder side of the cap member 2 is a portion of a polish rod I5 lying inthe two grooves, as shown in Fig. 3. The grooves are suificientlyshallow to prevent the members I and 2 from engaging each other on theiropposing faces, so" that the members I and 2 will firmly engage thepolish rod when the latch member comprising the links 5 and 6 and thelever 9 has its lever 9 forced down on the lug II].

In order to release the polish rod from the grip, it is only necessaryto loosen the nut I2 and then swing the latch forwardly as shown indotted lines in Fig. 3, whereupon the cap. or gate member 2 can belifted torelease the polish rod.

A spring I6 surrounds the bolt II between the lever 9 and the link 6 torelease the lever from the lug II] when the nut I2 is loosened.

This structure discloses a true compound lever system of the secondorder wherein the cap member 2 forms the first lever whose fulcrum isintermediate of its ends and on the rod I5. The hinge-pin 3 provides thepoint of application of one force to the first lever and the projectinglug It provides the point of application of the other force, each beingon opposite sides of the fulcrum of the cap member. The second lever 9is pivoted on the pin 8 which represents the point of application of thefixed forces and the opposite or free end of the lever 9 is the point ofapplication ofthe variable forces which are provided by screwing the nutI2 down against the lever. The fulcrum point of this lever isintermediate of its ends and is arranged to engage the lug ID of thefirst lever.

I claim:- 1. In a rod gripping device, the combination of a memberhaving a groove on its face arranged to receive a rod, compound levermeans including two levers, the first lever'being hingedly connected tothe member at one side thereof and arranged to bear against a rod insaid groove, the second lever operatively connected at one endwith theother side of the member and having its intermediate portion fulcrumedon the free end of the first lever, and means operatively connected tothe member and the free end of the second lever for forcing itsintermediate portion against the free end of the first lever. 25

2. In a rod gripping device, the combination of a body member, acapmember hingedly connected at one side to the body member, saidmembers being provided with mating grooves to receive the rod, a pair oflinks hinged at one end to the other side of the body member, a leverpivotally connected at one of its ends to one of said links, and meanscarried by the other link and arranged to engage the free end of thelever to force the latter against the cap member and thus clamp the basemember and cap member together.

3. In a rod gripping device, the combination of a body member, a capmember hingedly connected at one side to the body member, said membersbeing provided with mating grooves to receive the rod, a pair of linkshinged at one end to the other side of the body member, a leverpivotally con nected at one of its ends to one of said links and havinga bifurcated free end arranged to straddle the other link, and meanscarried by said other link and arranged to engage said lever to forcethe latter against the cap member and thus clamp the latter to the bodymember.

4. In a rod gripping device, the combination of a body member grooved toreceive the rod, a cap member having a groove arranged to mate with thegroove of the body member and pivotally connected at one side of thegroove to the body member, a pair of parallel links hinged at one end tothe other side of the body member, the cap mem- 55 ber having alaterally projecting portion which is straddled by said links when thecap is swung into its closed relation to the body member, a leverpivotally connected to one of said links and arranged to be swung intoposition. to bear on said protruding end of the cap, and meansadjustable on the other link member and arranged to bear on the free endof said lever to clamp the body and cap members together.

5. In a rod gripping device, the combination of a body member, a capmember hingedly connected to the body member at one side, said membersbeing provided with mating grooves to receive the rod, said cap memberhaving a lug on its other side, a pair of links hinged at one end to thebody member and arranged to straddle the lug when the cap member is inits closed position, a lever pivotally connected at one of its ends toone of said links, and means carried by the other link and arranged toengage the free end of the lever to force the latter against the lug andthus clamp the body member and the cap member together.

6. In a rod gripping device, the combination of a body member, a capmember hingedly connected to the body member at one side, said membersbeing provided with mating grooves to receive the rod, said cap memberhaving a lug on its other side, a pair of links hinged at one end to thebody member and arranged to straddle the lug when the cap member is inits closed position, a lever pivotally connected at one of its ends toone of said links, the free end of said lever being bifurcated andarranged to straddle the other link, and means carried by said otherlink and arranged to engage said lever to force the latter against saidlug and thus clamp the body member and the cap member together.

7. In a rod gripping device, the combination of a base member, a capmember pivoted toone side thereof, a pair of links each pivoted at oneof its ends to the base member at the side thereof opposite the pivotalconnection of the cap member, a lever carried by the outer end of onelink and overlying a portion of the cap member, a screw carried by theouter end of the other link, and a nut on the screw arranged to engagethe lever and increase its pressure on the cap member when closed on thebase member with the rod seated between the two members.

8. In a rod gripping device, the combination of a body member having agroove on its face, a cap member hingedly connected to the body memberat one side thereof, and having a groove arranged to register with thegroove in the body member, a lever means operatively connected at oneend with the other side of the body member, the intermediate portion ofwhich is arranged to bear directly on the free end of the cap member toclamp a rod in said grooves, and means connected to the body member andsaid lever means for forcing said intermediate portion against said capmember.

9. In a rod gripping device, the combination of a body member having agroove on its face arranged to receive arod, a compound lever meansincluding two levers, the first lever comprising a cap member connectedat one end to the body member at one side thereof and having a groovearranged to register with the groove in the body member, the groove inthe cap member being arranged to act on a rod to provide the fulcrum ofthe first lever, the second lever operatively connected at one end withthe other side of the body member, the intermediate portion of whichforms the fulcrum of said second lever and is arranged to bear directlyon the free end of the cap member, and means connected to the bodymember and the second lever for forcing the other end of the secondlever toward the cap member causing the fulcrum of the second lever toact upon the first lever thereby clamping a rod in said grooves.

MERTON T. ARCHER.

